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Smart Power Systems improves mobile power generation by providing electronic control integration into SAE J1939 vehicle multiplexing systems, adding onboard diagnostics with event recording. Electronic control enables precise frequency output by controlling fluid flow through a hydraulic motor, ensuring a constant frequency output. Automated control features protect the system from conditions outside its designed operating parameters that may cause damage. The electronic controlled Multiplexing Interface Module communicates operation parameters in SAE J1939 approved format for integration with vehicle multiplexing. This paper describes the design and features of electronic controlled hydraulic generators, and how the use of SAE J1939 has expanded the functionality of the system while making operation simpler for the user.